Polar Loop
8 days per charge and 29 g, with no screen and no subscription. It has no GPS, so routes come from your phone through the Flow app.
What the maker states
| Smartwatch battery | 8 days, Smartwatch mode |
|---|---|
| Weight | 29 g, With band |
| Water rating | WR30 |
| Heart rate sensor | Optical, Precision Prime, OHR Gen 3.5 |
| External sensors | Bluetooth |
| Subscription | None for core features |
| App | POLAR Flow |